题解 | #买卖股票的最好时机(一)#

from types import FrameType
#
# 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
#
# 
# @param prices int整型一维数组 
# @return int整型
#
from math import inf
class Solution:
    def maxProfit(self , prices: List[int]) -> int:
        # write code here
        minPrice, ans = prices[0], -inf
        for x in prices:
            ans = max(ans, x - minPrice)
            minPrice = min(minPrice, x)
        return ans